Activate Firefox Relay - Mask your email address
Relay is a Firefox extension that keeps your real email address from companies you don’t trust.
Create an email mask through Firefox Relay
How to create an email mask on Relay.
Disable email forwarding - Stop receiving emails sent through your masks
You can permanently delete a mask or temporarily disable forwarding to stop receiving emails in your inbox.
Install the Firefox Relay extension on Firefox for desktop
Extensions help you customize and add functionalities to Firefox. When you use the Relay extension you can generate a mask at the time of registering on a website.